Sorry that I also don't have the link, but I can tell you why they weren't made: time restraints.
In the LIVE Letter and interviews Yoshi explained they barely had (and will have going forward into the future) the room in their development schedules to make two new player body models. They knew they had to implement Viera as the demand for it was already huge, but they also had the demand for a more beastlike race. Only being able to make two body models AND wanting to meet both demands they decided to make a female Viera body and male Hrothgar (Ronso) body. Yoshi also mentioned this is not simply a problem throwing more money at would solve. Adding more body models adds a permanent workload on top of the very tight schedule they already have, as they seemingly need to manually check every piece of armor they have and make on all body models, making sure they fit well. Also when adding body models they need to add unique emotes to it, like every race/gender combination has it's own unique /wave, /dance, etc. etc.
However! He has explicitly stated he's not saying 'no' to male Viera and female Ro.. Hrothgar. What he is saying though is that if they are to ever add them (which won't be soon at all!) they would only be able to do so if they found a way to cut down efficiently onto the current permanent development workload that all current in-game bodymodels have. So he's not saying he's opposed to having the missing genders in the game, just that as things are right now it isn't possible.
That being said though. The devteam has surprised us time and time again with their passion and dedication for this game, working themselves to the bone to deliver on the demands of the audience. The current male Viera thread is like 860+ pages long, you can be damn sure that the team is very actively looking into adding the missing genders somehow, doing everything they can to somehow make it work. And if they truly can't deliver they always have a good (though perhaps still not satisfactory) answer, giving us the reason they are unable to deliver. Hope that answer your question a bit
